Illumination



L. W. BUGBEE AND E. D. TILLYER.

ILLUMINATION.

APPLICATION FILED JAN. 2. 19H.

Pmmm July 13, 1.92%

A TTORII E KS eieivceo.

L'U'CMN W, BUGBEE AIM) EDGAR. ID. TILLYER, @F SOUTHBMDGE, MASSACHUSETTS,

ASSIKG NQRS T0 AMERICAN @JPTIGAJL COMFANY,

01E SUUTHERIIDGE, MA$SACHU- EI'ETTS, 9 VOLUNTARY ASSOCIATION @TEMASSAGHUSETTS.

ILLUMINATIUN.

Specification of Letters Patent. Pmf g fmfl 5 11 13 192% Applicationfiled January 1917. semi 1m items.

To all whom may concem:

which the t'ciievviiig is a, specificetieiiq Um invention ieizttes toillumination i c has pertlciiime tetei'ence to type e2; seuirees 0iiiiumiimticii disclosed mid in cut" 133,635,

ci the ieeding cbiects cf the p I'Q/SQI" invention is the piccvisieii man imprev source of iiitimiiieticii sucii as it i at the genemichamctei" described PiiCit'iJiOii iceitei ied te, but which eiiedi @iiuse in edditicii ueueiiy empieyed ct edditiciiel 0]? ece eif Tediaipii,iiicthei ebiect is previssi "i an. impmved .b icti tifi reflected rays 7pmduee umiiicsity ewer he the same may be eiite ce f 0 me bit),

tiliiififir QiOieCiW ulfl'. 5t MESS Cit).

J3 SO diTCQ ULL copending eppiication Serial L tile present HIVQIIE e egeneral-tea Y e a when i'ieec. "'w

and advantages cf cm i speciiic disclosures illustrated and describedwlthiii the scope of the appended claims Without departing from orexceeding the spirit of cut: invention,

T 1F1gu 'e i i epresents a vertlcai sectlomii view iiiustmting oneembodiment of our impreved light ig. represents a simiizii" view of en-(Dilileff 'cciistiuctioii therecfi I iepi'esents e hei'izcntai sectionedin the drawings, the 11m designates i r wi- 1 J. csed Withe pi ic is thect ctiicai me ccneemec,

1: c L W1 the eeme time in t e suppcrt tor the memen o the radiant scdm6 tc eeted upcii by the heat rays. It will be understood that a numberof substances may be employed for this purpose, such as a cerium oxid orthorium oxid, and that this substance may be a discontinuous radiatorwhich does not have to be a conductor, in that no electrical current ispassed through the substance 6", the heating eflect on this substancebeing entirely from the direct inward radiation from the filament orfilaments 4 and the refiected heat rediation stopped 0d and reflectedback to the center by the film 3.

' These backwardly reflected radiations will thus increasethetemperature of the material 6 until it becomes luminous and gives offheat and light radiations of its own, in this event the heat radiationsbeing again reflected back onto the substance to increase its heatingwhile the light radiations pass through the reflecting film 3 and areuseful as visible light.

lB rom the foregoing description taken in connection with theaccompanying drawings, the construction and operation of our improvedluminous source should be readily apparent, and it will be seen that bythe use of our improvement we are able with a relatively small amount ofinitial energy to produce an extremely desirable and satisfactory light,in that the heat radiations ordinarily forming a large part of theenergy consumed in producing illumination in place of being radiated andlost are all reflected back and made use of, while in addition by theprovision of the material 6 on which these radiations are focused a muchbrighter and more satisfactory source of illumination is obtained thanis possible even in our previous improvement in which these radiationsare focused back on and serve to additionally increase the luminosity ofthe film itself.

lit will also be understood that by the use of our improvement we areable to greatly prolong the life of the bulb in that the heat radiationsare not primarily in this instance focused on the filament tending toimpair the life of the conductor, but are focused on the inertnon-conducting material and consequently in nowise interfere with theconductor.

It will further be understood that while we have especially illustratedand described our invention as applicable in connection wit-h aconducting radiant and a supplemental non-conducting radiant,that it isequally applicable in those cases where the supplemental radiant is alsoa" conductor, or is of a material which will be rendered conductive whensuitably heated. ln this latter reaarra it will become conductive whereadditional electrical or other .energization may be employed to produceincandescence or luminosity in the supplemental radiant. In this eventif the position of the parts is such as is illustrated in theaccompanying drawing; the supplemental radiant will be found to be atthe focal center of the reflector, consequently all heat radiationstherefrom will be focused back thereonto to constantly increase theheating of the supplemental radiant for a'given amount of energy andthus increase its luminous efliciency.

It will further be understood that while we have shown our improvementas especially applied to an inclosed bulb, that it is capable of usewith various sources of illumination, in connection with which acondensing reflector may be employed, and that we, therefore, do notwish to be llmited in any manner to the specific construction hereillustrated, which has merely been chosen as satisfactorily disclosingthe several generic principles of our invention as combined in the mosteflicient manner so far determined by us for their utilization forgeneral illumination purposes, it being understood that for specificconditions different specific forms of illuminating devices areadvantageously employed, and that our invention is capable of employmentin a multiplicity of detailed specific embdiments. i

Similarly, it will be understood that it'is not necesary for thesupplemental retainer to be inclosed by the main radiant or that saidparts be concentrically arranged, since of heat radiations, and a mainradiant for I supplying said radiations encircling the supplementalradiant whereby outwardly directed heat radiations therefrom will befocused back to the supplemental radiant by the inclosing bulb andinwardly. directed heat radiations will have a direct heating action onthe supplemental radiant, substantially as and for thepurpose described.

2. A source of luminosity, comprising a skeleton source of radiantenergy, a supple mental radiant disposed within the skeleton source, anda spherical bulb inelosing the mclia11ts,seid loullo being concentric"Wi'lfill lln testimony "whereof We affix @113? Signed the mam andsupplemental rmlmnts and lures 1n the presence of lJWO wl'ltnesses.

having its inner face coated. "with a, metallic LUCIAN W. BUGBEE, filmwhich Will fumnsmib Visible reelizmtiens EDGAR D, TllbLYElf-i, anclretard by reflection and focus beck the Witnesses:

hem radiations onto the main and supple- E. HAWOR5eN mental mdiants. l.U. ZINE.

